The stuff in vape juice is primarily propylene glycol, vegetable glycerin, nicotine and flavorings.
Propylene glycol and vegetable glycerin are mostly tasteless compared to the next two ingredients.
Nicotine is VERY bitter and flavor extracts when concentrated can be seen as overwhelming and thus bad to our palettes.
Think of it like a little bit of chili powder in a dish gives it a nice flavor and subtle heat but a spoonful of it will burn.
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